Saw-stretcher attachment



March 10, 1925- M. W. EDWARDS SAW STRETCHER ATTACHMENT Filed July 12, 1923 lllllllllllllllllIllllllllllllllll!lllllIlllllllllllllllillllll BY m we m o f 7 B 2M 6M 3 3 3 W. 4 a M 9 H QQESEQEQ 4 2 /J v 27 fix a 9 Fa J f 2 38 ATTORNEYS.

to date saw stretching machine. -modern machines of this character are pro- Patented Mar. 10, 1925.

MATTHEW wannnnwanns. or AL ION, CALIFORNIA.

sAw-sTnETorrEn ATTACHMENT.

Application filcdlulyilg,1923i Serial 'NQ- 651,152.

ToaZZ whom it may concern.

Be it known that I, MATTHEW WARD E1)- wnnns, a citizen of the *United States, and aresident of Albion, county of Mendocino,

State of Oaliforniayhave invented a new and useful Saw-Stretcher Attachment, of which the following is a specification;

The present invention relates to imp-rovements in saw stretching machines, and its particular object. is to provide an attachment for a saw stretching machine that will allow saws, particularly band saws that have been dished or otherwise curvedin the operation of the same, to 'be' straightened. It is particularly proposed to provide an attachment ofthis character that can be conveniently used in connection with an up Themost vided with two rollers adaptedto cooperate .in engaging the saw blade-and in, advancing the same, the two rollers: being; mounted; with freedom of ZLXlZtl: slidmg motion. so that they cansuccess'ively engage successive portions of thesaw withont requiring any shifting of .the'latt'er. Themaehine is further provided with means for adjusting the upper roller for affecting a tight engagement between the two rollers and the sawblade. The particular object of the presentinvention is to provide an attachment ofthe character clescribed'thatcan be readily used in connection with the lower roller asv well as with the upper roller so that it may be movedto suit the requirements of the case without necessitating the removal of the saw. Further objects and advantages, of my device will appeal-as. the specification proceeds.

The preferred form of the invention is illustrated in the. accompanying drawing in which Figural shows a perspectiveview of a modern saw stretching machine having my device attached thereto Figure- 2 a front view of my device with the position of certainelements of the machine; 'shown'in dot- 1 ted lines; Figure an enlarged plan'view of my device; Figured-a sectional iew taken along line IV-IV o-f-Figirre 3; Figure 5. a plan view of aring adapted tobensed for holding my device in an operative position when used in connection with the upper roller; Figure. 6 a sectiollta-ken alongline VI-VI of Figure 5.; Figure 7 enlarged detail view of an eye bolt used in my device; Figure, 8 ,a, section. through the. machine taken along line VIIIVIII;0 Figu-retl; and

Figure-9 aview ofa spring used in thedevice. While I have shown only the preferred form ,ol -the invention, it should be understood that various changes .or modifications may be made within the scopeofthe claims hereto attached without departing from-thespirit of the invention.

Thesaw stretching machine, (1), shown in .perspectiveviewin Figure l-is of standard snake and comprisesa pedestal; (2) abase plate; 3) resting thereon'having two standards (4) :risingztherefrom, a: cross beam ('6) pivoted'tothe standards as shown at (;7) ,a

-:latch-bar ('8). engaging-thecross beam as shown. at 9) for holding the same in a horizQl tal position, and-a head (r l-1) slidable in a the cross beam. As may be seen from Fig- ;1llfe 8 a casting (12) supporting two bearings (13). is adapted tobe.moved vertically hymean-sof-a threaded member (14:) passthroughthe head (11:) and engaging a access (,16); in the-casting. Ahandle (17) is provided for;rotating the; threaded nen ber -(14 Inthetwobearings issupportedashaft (18) which lattercarries between thetwobearings a roll.(19). It will be seenthat: due to this. constru-ctionthe;roll 19) may be raisedand-lowered by turning the handle (17),- and .isalso capable-of axial motion by sliding thehead (11) on the cross beam (6).. A lower roller.(2l).lis provided between two bearings (22) on ashaft (23 .L'GCQWlIlg rotary motion from. a pinion (24).

The two bearings (22) areslidable in the base lay/means not sho-wn in the drawing. j

My invention consists princ pally 1n ;the member (26) shown in detail inFignresB and 4, and comprising two arch-ed loarsv (.27) and two cross-members (2.8). engaging the ends o-fthe bars and holdingthe same in- .spaced relation. From the center of each end member (2.8.) extends aproj ectioni (29),

the functionof xwhich will be explained later. a I

To use my device in connection with the lower roll it is only necessary to p 'laeethe inemlaer (2.6) on the-two bearings (22). in

such a manner that the two arched bars (27)- straddle the lower roll t 21 1 and proi ect be- .yond the sameso. that when. the bladeof the saw is engaged by the two rollers, the two of. the saw blade. out of, the plan-e ofengagementr Ass-inning, therefore, that the saw (-31.)- to be stretchedihas becomedished as illustrated in Figure-.2, itIwi-ll be placed on arched bars (QZiwill: force adiacent parts 7 the two arched members (27 in the .manner shown in said figure, and the upper roll will then be forced down upon the lower roll whereupon the sawv blade is advanced by the rotation of the two rolls and at the same time straightened out, because the two arched bars keep the adjacent parts of the.

saw at a higher elevation than the part en gaged between the two rollers.

While in connection with the lower saw it is only necessary to lay my device on the two bearings, a different method has to be used when my device is to cooperate with the upper roller. For this purpose I provide the ring (32) adaptedto be placed around the top of the head (11). 1 The ring is provided with lateral lips extending outwardly,

one of them having a perforation (34) I therethrough, while the other is slotted as shown at (36). Two springs (87),one-of which is shown in detail in Figure 9, terminating in rings (38) are adapted'to engage with one end of the notches (39) in the projections (29) of the member (26), and are secured with their other end to eye bolts (41),,one of which is shown in Figure 7. One of the eye bolts is passed through the perforation (34:) in one of the lips of the ring (32) and held in'place by means of a wing nut (42), whilethe othereye bolt is engaged with the slot (36) of the ring (32) and also held in place by means of a wing nut. I

' To attach my device for use in connection with the upper roller the two arched bars (27) are placed to straddle the said roller, one orthe springs is engaged with the notch (39) of one of the projections (29), while its v eye bolt is extended through the perforation (34:) of'thelip (33) and secured by means of the wing nut (42) and the other spring (37) issecured to the other projection (29) of the member (26) and its eyebolt slipped into the slot (36) to be'held by the wing nut (42). The tension of the two springs (-87) may be adjusted by tightening or loosening the wing ,nuts (42). It will be seen that in this manner the member (26) is firmly held in place so as tostraddle the upper roller (19) and to force adjacent parts of thesaw out, of the 7 plane of that portion engaged bythe rollers while at thesame time it is elastic and does not interfere with the raising and lowering of the upper roller nor with an axial ad ustment of the same. L

Iclaimzf" 1. In combination wft'h a saw strteching machlne having'a lower roller, an upper roller cooperating therewith for advancing the saw by engaging anintermedi'ate portion thereof and a cross beam with a head slidable thereon supporting the upper roller, a member formed to straddlethe active portion of theupper roller having elementspro- "jecting beyond the saidroller on opposite sides thereof for forcing adjacent portions of the saw out of the plane of engagement and means engaging the head so as to be movable with the same for supporting the said member.

2. In combination with a saw stretching machine having a lower roller, an upper roller cooperating therewith for advancing the saw by engaging an intermediate portion thereof and a cross beam with a head 1 slidable thereon supporting the upper roller,

a member formed to straddle the active portion of the upper roller having elements projecting beyondthe said roller on'opposite sides thereof for forcingadjacentportions of the. saw out of the plane of engagement and means engaging the head for; supporting the said member, comprising a ring-adapted to be placed over the head and an operative connection between the ring and the straddling member.

3. In combination with a saw stretching machine having a lower roller, an upper roller cooperating therewith for advancing the saw by engaging an mtermedlate portion thereof and a cross beam with a head slidable thereon supporting the upper roller, a

member formed to straddle-the active portion of the upper roller having elements pro- .jecting beyond the said roller on opposite sides thereof for forcing adjacent portion of the saw out of the plane of engagement andmeans engaging the head for supporting the said member, comprising a ring adapted to be placedover the head having two lips extending therefromin opposite direction, two registering projections on the straddling member and operative connections between the lips and the projections.

4. In combination with a saw stretching machine having a lower roller; an upper roller cooperating therewith for advancing the saw by engaging an intermediate portion thereof and a cross beam with a head slidable thereon supporting the upper roller with freedom of vertical adjustability, a

member formed to straddle the active por-' tion of the upper roller having elements projecting beyond the said roller on opposite sides thereof for vforcing adjacent portions of the saw out of the plane of engagement and yielding means engaging the head for supporting the said member, comprising a ring adapted to be placed over the head and a spring connection between the ring and the straddling member.

6. In combination with a saw stretching machine having a lower roller, an upper roller cooperating therewith for advancing the saw by engaging an intermediate portion thereof and a cross beam with a head slidable thereon supporting the upper roller with freedom of vertical adjustability, a member formed to straddle the active portion of the upper roller having elements projecting beyond the said roller on opposite sides thereof for forcing adjacent portions of the saw out of the plane of engagement and yielding means engaging the head for supporting the said member, comprising a ring adapted to be placed over the head having two lips extending therefrom in opposite direction, two registering projections on the straddling member and spring connections between the lips and the projections. MATTHEW WARD EDWARDS. 

